What Does U025C Mean?
The powertrain control module (PCM) or gateway has lost communication with a specialized vehicle control module designated as 'D'. This indicates a network communication failure on the vehicle's CAN bus or other data network affecting specialty vehicle functions.
Common Causes
35%
Faulty special purpose module 'D' internal failure or power supply issue
30%
Damaged wiring harness or connector to the special purpose module
20%
CAN bus network fault or termination resistor failure
10%
Gateway module communication fault
5%
Low vehicle battery voltage causing module dropout
Diagnostic Steps
1
Step 1: Verify battery voltage is above 12.0V and charging system is functioning properly
2
Step 2: Locate Special Purpose Vehicle Control Module 'D' using wiring diagrams and inspect connector for corrosion, damage, or loose pins
3
Step 3: Test power and ground circuits to the module using a multimeter
4
Step 4: Check CAN bus network integrity using a scope or multimeter to verify proper voltage levels (2.5V nominal, oscillating between 2.0-3.5V)
5
Step 5: If communication remains lost, attempt module reprogramming or replacement after confirming all circuits are intact
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The powertrain control module (PCM) or gateway has lost communication with a specialized vehicle control module designated as 'D'. This indicates a network communication failure on the vehicle's CAN bus or other data network affecting specialty vehicle functions.
The most common cause of U025C (Lost Communication With Special Purpose Vehicle Control Module "D") is: Faulty special purpose module 'D' internal failure or power supply issue
Typical repair costs for U025C range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safety impact depends on the function of the special purpose module. Vehicle may have reduced functionality in specialty systems but basic operation typically remains intact.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U025C to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Network Communication
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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